Abstract: A block set for building models. The block set includes a first cuboid block. The first cuboid block includes stacking surfaces including a first stacking surface and a second stacking surface substantially parallel to the first stacking surface. The first cuboid block includes side surfaces extending between the stacking surfaces for interlocking said first cuboid block to other cuboid blocks by sliding said first cuboid block adjacent to other cuboid blocks in a direction from the first stacking surface to the second stacking surface. A first side surface opposes a second side surface. The first side surface includes a dovetail-shaped proturbance for receipt by a second side surface of a second cuboid block. The second side surface of the first cuboid block defines a formation for receiving a dovetail-shaped proturbance of a first side surface of a third cuboid block.

Abstract: A broad-band antenna includes in a common plane tow symmetrical parts (2,3) each including at least two interconnected conductor strands (4,5,7,8;19,20,21) powered by a double-wire line (10;22), each strand including in its portion opposite the double-wire line, a resistive load (11,12,14,15;23,24,25,26).